WO2009043205A1

WO2009043205A1 - A method for negotiating the network unit ip capability at the network side

Info

Publication number: WO2009043205A1
Application number: PCT/CN2007/003310
Authority: WO
Inventors: Junyi Liu; Donghua Chen
Original assignee: Zte Corporation
Priority date: 2007-09-29
Filing date: 2007-11-22
Publication date: 2009-04-09
Also published as: CN101400063A

Abstract

A method for negotiating the network unit IP capability at the network side used in the access authentication of the WiMAX terminal user includes steps: configuring the supported IP capability for a ASN gateway abutting on the ASN gateway or AAA server in CSN (Connect Service Network) on the ASN (Access Service Network) gateway; when it needs to check the IP capability for the ASN gateway of the opposite end node or AAA server in CSN, the ASN gateway matches itself supported IP capability with IP capability of the opposite end node, if there are the matching items, and selects one IP capability of the matching items to continue the service according to itself policy; otherwise terminates the service according to itself policy. Due to negotiating IP capability for the terminal in advance, the present invention reduces the service fault probability when the terminal is moving and accessing, and ensures the network stability.

Description

TECHNICAL FIELD The present invention relates to a method for negotiating a network element IP capability by using a network side, and more particularly to a network side capable of correctly selecting a mobile terminal when a mobile station accesses a WiMAX network. IP or simple IP method. BACKGROUND OF THE INVENTION Referring to Figure 1, a prior art WiMAX system generally consists of three parts: a terminal, an Access Service Network (ASN), and a Connect Service Network (CSN). The access service network ASN provides a complete set of radio access network functions for end users accessing WiMAX. The ASN consists of one or more base stations (BS) and one or more ASN-GWs (ASN gateways). . The operator who manages the ASN is called a Network Access Point (NAP). The ASN acts as an access network and can be shared by multiple CSNs (or multiple Network Service Points (NSPs)). This is called "ASN Sharing", also known as "NAP Sharing". ASN mainly performs the following functions: completing Layer 2 (L2) connection of WiMAX terminal, transmitting AAA message to H-NSP (Home NSP), NSP network selection and discovery, and relaying Layer 3 (L3) connection of WiMAX terminal , radio resource management, tunnel maintenance between ASN and CSN. In the mobile scenario, the ASN also needs to support the following functions: ASN Anchored MM, CSN Anchored MM, Paging and Idle Mode operations .

The ASN is also used to manage the IEEE 802.16 air interface to provide wireless access to WiMAX end users. The ASN consists of at least one BS and one ASN-GW (AGW, ASN Gateway), and may include a single ASN-GW or multiple ASN-GWs. The reference model is shown in Figure 2 and Figure 3. The ASN interworks with the MS (Mobile Station) at the R1 reference point, interworks with the CSN at the R3 reference point, and communicates with the other ASN at the R4 reference point.

CSN is a combination of network functions that provide IP connectivity for WiMAX end users. The CSN can be composed of a router, an AAA proxy or server (AAA Proxy / Server), an end user database, and an interconnection gateway device. As mentioned above, the operator managing the CSN is called the NSP. CSN mainly provides the following functions: end user session connection, terminal IP address allocation, Internet access, AAA proxy or server, end user policy and license control, tunnel maintenance between ASN and CSN, end user billing and Settlement, roaming between CSNs, mobility management between CSNs, and WiMAX services. In the current WiMAX network architecture, the management method of the terminal user IP address is divided into two network architectures: a simple IP network architecture and a mobile IP network architecture.

"Simple IP" is relative to "Mobile IP". For the terminal, the MIP protocol (IETF RFC3344) is not supported, and the terminal can only be obtained through a mechanism such as DHCP (Dynamic Host Configure Protocol) or static configuration. The terminal of the user IP address and its associated configuration information is referred to as a "only support simple IP"terminal; similarly, there are also "Mobile IP only" enabled terminals and "simultaneously supported simple IP and mobile IP" terminals. For the network side architecture, the network architecture of a network element or a functional entity that does not include an FA (Foreign Agent) / HA (Home Agent) is called a network architecture that supports only simple IP. Similarly, There is a network architecture that supports only Mobile IP and a network architecture that supports both Simple IP and Mobile IP. For the mobile WiMAX network architecture, the FA (external proxy) function in the Mobile IP protocol (take RFC3344 MIP4 as an example) is located in the ASN, and the HA (home agent) function is located in the CSN, that is, the FA belongs to the NAP, and the HA belongs to the NSP. As a result, the FA and the HA may belong to different operators, and the operator may deploy only a simple IP network or a mobile IP network based on their respective policies. Especially in the "NAP Sharing" scenario, there is a NAP with multiple NSPs, some NSPs are fixed network operators, and some NSPs are mobile operators. In order to protect the previous network investment, each NSP is only A mobile IP network or a simple IP network is deployed. In this case, the NAP needs to support both the mobile IP and the simple IP. However, before the end user establishes an L3 session through the NAP to access a specific NSP, the NAP needs to understand the IP capability of the NSP and select the appropriate one. The protocol and signaling procedures are used to establish an L3 session. Similarly, different ASNs have different IP capabilities deployed in their respective network plans. When a CSN anchored handover occurs (CSN anchored handover means that the end user moves to change the location of the ASN access point, ie the end user's data channel is switched to another ASN and is accessed from the new ASN. CSN, but the CSN remains unchanged before and after the handover. Take the mobile IP network as an example. At this time, the FA needs to be migrated and migrated from one ASN to another. If the target ASN (Target ASN) does not support the FA function, then the handover is performed. It will fail. In order to reduce this unnecessary failed handover, the two ASNs should be allowed to interact with their respective IP capabilities before switching, thereby reducing The probability of this switch failure. Therefore, the prior art has yet to be improved and developed. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for negotiating a network element IP capability by a network side. When a mobile station accesses a WiMAX network, the network side can correctly select to use mobile IP or simple IP. The technical solution of the method of the present invention includes: a method for negotiating a network element IP capability of a network side, which is used for access authentication of a WiMAX terminal user, and includes the following steps:

A. Configure an ASN network adjacent to the ASN gateway or an IP function supported by the AAA server in the service network (CSN) on the access service network (ASN) gateway, including the single IPv4, simple IPv6, and client- One or more of MIP4, Proxy-MIP4 Client-MIP6, Proxy-MIP6;

B. When it is necessary to check the ASN gateway of the opposite node or the AAA server IP capability in the CSN, the ASN gateway matches the IP capability supported by the ASN and the IP capability of the peer node.

15 In the match, select one of the IP capabilities to continue the service; otherwise, terminate the service according to its own policy. The method, wherein the step of checking the IP capability in the step B includes: the terminal user initiating an initial network access procedure needs to determine whether the terminal user can be authorized to access the WiMAX network, and the ASN needs to be directed to an online When the end user decides to initiate a CSN anchored handover.

The method described in the above, wherein, in the initial network access process of the WiMAX terminal user, the step B specifically includes:

Bl, WiMAX terminal users are ready to access the network and establish air interface signaling connections;

B2, the terminal and the base station and the ASN gateway perform basic capability negotiation;

After the basic capability negotiation is completed, the ASN gateway sends an identifier request message to the terminal, where 15 is used to obtain the network access identification (NAI) of the terminal user;

B4. The ASN gateway receives the identifier response message of the terminal, and obtains the network access identifier. B5. The ASN gateway parses the AAA server in the CSN that the terminal user needs to access according to the network access identifier, and configures the IP capability of the AAA server. The method, where the ASN gateway prepares a CSN anchor handover procedure initiated by an end user, includes: C1: If the handover is initiated by the current anchor ASN gateway, the IP in the step A is used before the handover. The capability configuration acquires the IP capability of the current serving ASN gateway node. If there is no IP capability matching the current ASN gateway, the handover is terminated. If there is an IP capability matching the current ASN gateway, the CSN anchoring handover process is completed. The method, where the ASN gateway prepares a CSN anchor handover procedure initiated by an end user, includes:

C2. When the handover is initiated by the current serving ASN gateway, the IP capability of the currently anchored ASN gateway node is obtained according to the IP capability configuration in the step A before the handover. If there is no IP capability matching the local ASN gateway, Then, the handover is terminated; if there is an IP capability matching the current ASN gateway, the handover process of completing the CSN 4 seeding is entered. A method for negotiating network element IP capability of a network side, which is used for access authentication of a WiMAX terminal user, and the following steps are performed: a. When the WiMAX terminal user access authentication is performed on the network side, the ASN accesses the request through the Radius. The message carries the IP capability supported by the ASN to the home CSN. b. The home CSN carries the IP capability supported by the CSN or the IP capability of the ASN required by the CSN to the ASN in the Radius Access Accept message. These IP capabilities refer to: Simple IPv4 Simple

One or more of IPv6, Client-MIP4, Proxy-MIP4, Client-MIP6, and Proxy-MIP6. The method, wherein a message supported by the R4 reference point is exchanged between the ASN and the ASN. The method for the network side to negotiate the use of the network element IP capability provided by the present invention reduces the service failure of the mobile and access services by using the IP capability negotiation of the terminal in advance, thereby ensuring the stability of the network. The drawings are intended to provide a further understanding of the invention, and are intended to be a part of the description of the invention. In the drawings: FIG. 1 is a schematic diagram of a prior art Wimax network architecture reference model; FIG. 2 is a schematic diagram of a prior art single ASN-GW ASN reference model; FIG. 3 is a prior art multi-ASN-GW ASN reference FIG. 4 is a schematic diagram of a static configuration and application flow of a network element IP capability of a method according to the present invention; FIG. 5 is a schematic diagram of an application scenario of a static configuration of a network element IP capability when an end user is initially accessed by the method of the present invention; FIG. 8 is a schematic diagram of an application scenario of a network element IP capability dynamic negotiation application when the terminal user is initially accessed by the method of the present invention; FIG. 8 is a schematic diagram of the L3 handover of the method of the present invention. Schematic diagram of dynamic negotiation application scenario of network element IP capability; FIG. 9 is a schematic diagram of a channel before and after CSN anchor switching of the method of the present invention. detailed description

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in more detail with reference to the accompanying drawings. The network side of the present invention negotiates a method for using the network element IP capability. The purpose of the network side is to enable the network side to correctly select to use mobile IP or simple IP when the mobile station accesses the WiMAX network. The actual execution point corresponding to the ASN in the method of the present invention is an ASN gateway, and the actual execution point corresponding to the CSN is an AAA server. The method of the present invention can be implemented by the following embodiments: First, the ASN statically configures the adjacent ASN and the IP capabilities supported by the CSN. These IP capabilities are: Simple IPv4, Simple IPv6, Client-MIP4, Proxy-MIP4, Client-MIP6, Proxy-MIP6, ASN can support all listed IP capabilities or one or several of them; When ASN is required to select IP capability, ASN matches its supported IP capabilities and the selected ASN/CSN IP. Capability, if there is a match, select one of the IP capabilities to continue the service according to the policy. The match here means that the ASN and the CSN support at least one of the four IP capabilities; if there is no matching IP capability, The termination of the service according to its own strategy is various and is well known in the prior art and will not be described here. When the ASN selects the IP capability, it mainly refers to the following two situations: The terminal initiates an initial network entry process, and needs to determine whether the terminal user can be authorized to access the WiMAX network; and, the ASN needs to make decisions for an online terminal user, whether to initiate CSN anchored when switching. Second, when the WiMAX terminal user access authentication is performed on the network side, the ASN carries the IP capability supported by the ASN to the home CSN through the Radius Access Request (Access-Request) message, and the home CSN is accepted in the Radius access (Access-Accept). The message carries the IP capability supported by the CSN or the IP capability of the CSN to the ASN. The IP capabilities are: Simple IPv4, Simple IPv6, Client-MIP4, Proxy-MIP4, Client-MIP6, Proxy-MIP6, ASN. All IP capabilities can be supported or one or several of them. The ASN and the ASN can exchange their respective supported IP capabilities through the message of the R4 reference point. The above two embodiments may be selected in the network deployment, or used at the same time. Each of the scenarios of each embodiment is separately described below to clearly illustrate the technical concept of the method of the present invention. As shown in Figure 4, when the AGW static configuration is used, the R3/R4 reference point message does not need to be negotiated with the adjacent ASN or CSN, so that the local query can be performed quickly. However, as the number of adjacent nodes increases, the management of the static configuration changes. More difficult. The static configuration process includes: Step S100: Configure an ASN gateway adjacent to the ASN gateway or an IP function supported by the AAA server in the CSN on the ASN gateway, including simple IPv4, simple IPv6, Client-MIP4, and Proxy-MIP4 Client-MIP6. Proxy-MIP6, these capabilities are not mutually exclusive and can be multi-selected; Step S200: When it is necessary to check the capabilities of the peer node (ASN gateway or AAA server in the CSN), the ASN gateway matches its own support. The IP capability and the IP capability of the peer node, if there is a match, select one of the IP capabilities to continue the service according to its own policy; if there is no matching IP capability, the service is terminated according to its own policy. For the capability of checking the peer node (the ASN gateway or the AAA server in the CSN) in step S200, it refers to two states: when the WiMAX terminal user initially accesses the network, the CSN is anchored. As shown in FIG. 5, when the scenario 1 is that the WiMAX terminal user initially accesses the network, the following steps are specifically included: Step S201: The WiMAX terminal user prepares to access the network, establishes an air interface signaling connection; Step S202: The terminal and the base station And the ASN gateway performs the basic capability negotiation; Step S203: After the basic capability negotiation is completed, the ASN gateway sends an EAP Transfer/ID Request message to the terminal, which is used to obtain the network access identifier (NAI) of the terminal user; Step S204: The ASN gateway receives the identity response of the terminal ( EAP Transfer/ID

Response message: obtaining the network access identifier; Step S205: The ASN gateway parses the AAA server in the CSN that the terminal user needs to access according to the network identity, and obtains the AAA server according to the IP capability configuration in step S100. The IP capability of the AAA server is compared with the IP capability of the ASN gateway. If there is a matching IP capability, the subsequent access process is continued. If there is no matching IP capability, the access is terminated. Step S206 ~ 208: Continue the access process of the terminal user, including: an authentication and authorization process of the WiMAX terminal user (EAP Procedure); a registration negotiation process, such as CS capability negotiation; and a preliminary service flow establishment process. This access process is a well-known process in the prior art and will not be described here. In scenario 2, that is, when the ASN gateway is ready to initiate a CSN anchoring handover for an end user, the process includes:

The switching of the CSN anchor is the switching of the end user data channel triggered by the network side according to the current network quality, the local policy and other parameters as the reference for the currently anchored ASN gateway or the serving ASN gateway. The reason is usually the end user's mobile. Different CSN anchoring is required. As shown in Figure 9, the data channel change of the terminal user before and after the handover is given. One of the main goals of the handover is to replace the anchored ASN gateway. The "4 Miao ASN Gateway" in the figure is the anchor before the handover. The ASN gateway, "Serving ASN Gateway" is the serving ASN gateway before the handover, and is ready to replace the original anchored ASN gateway. After the handover is completed, the actually anchored ASN gateway will be migrated to the "service ASN gateway" before the handover, which also means that the anchored ASN gateway and the service ASN gateway are combined into one after the handover is completed. As shown in FIG. 6, the process of determining the IP capability of the peer ASN gateway node by the ASN gateway node before the CSN anchor handover of the method of the present invention includes: Step S211: If the handover is initiated by the current anchor ASN gateway, The IP capability of the current serving ASN gateway node is obtained according to the IP capability configuration in S100 before the handover. If there is no IP capability matching the current ASN gateway, the handover is terminated. If there is an IP capability matching the local ASN gateway, the process proceeds to the step. S213: Step S212: If the handover is initiated by the current serving ASN gateway, obtain the IP capability of the currently anchored ASN gateway node according to the IP capability configuration in S100 before the handover, if there is no IP capability matching the local ASN gateway, Ending the handover; if there is an IP capability matching the current ASN gateway, proceeding to step S213; Step S213: completing the handover procedure of the CSN anchor. As shown in FIG. 7 and FIG. 8, the IP capability dynamic negotiation process of the network element node based on the end user service flow is given. It is not excluded that other processes may also use such an IP capability negotiation process. Scenario 3 is an IP capability negotiation process used by the WiMAX terminal user to initially access the network. As shown in FIG. 7, the method includes the following steps: Step S301: The WiMAX terminal user prepares to access the network to establish an air interface signaling connection; Step S302: The terminal and the terminal The basic capability negotiation is performed by the BS and the ASN gateway. Step S303: After the basic capability negotiation is completed, the ASN gateway sends an EAP Transfer/ID Request message to the terminal, which is used to obtain the network access identifier (NAI) of the terminal user; S304: The ASN gateway receives the identity response of the terminal (EAP Transfer/ID)

Response message: Obtaining the network access identifier; Step S305: The ASN gateway initiates an EAP authentication request of the terminal user to the AAA server in the CSN through the Radius access request (Access Request) message, in the access request message Carrying the IP capability supported by the ASN gateway; Step S306: Performing an EAP authentication process between the terminal and the AAA server; Step S307: After the authentication succeeds, the UI server sends an Access Accept message to the ASN gateway, in the access accept message. Carry the IP capabilities supported by CSN or CSN selected The IP capability to be used in this session; Steps S308 and S309 continue the access process of the terminal user. In the step S307, the AAA server in the CSN can be used as the negotiation decision point, and the IP address supported by the ASN gateway carried in the access request message is negotiated by the ASN gateway. To the ASN gateway, if the AAA server cannot accept any IP capability carried in the access request message, it sends an Access Reject message to the ASN gateway, rejecting the current access. In the step S306, if the AAA server in the CSN is not used as the negotiation decision point, the access acceptance message that is returned to the ASN gateway may be set to include multiple IP capabilities supported by the AAA server, and the ASN gateway As the negotiation decision point of the IP capability, the IP capability supported by the AAA server included in the returned access accept message may be selected as one of the IP capabilities used by the current access. Scenario 4, that is, the ASN gateway prepares to initiate a CSN anchoring handover process for an end user, and the CSN anchoring handover is described in the description of scenario 2. As shown in FIG. 8, a negotiation process for anchoring the IP capabilities of the ASN gateway and the serving ASN gateway before the CSN anchoring handover of the method of the present invention is provided, which includes the specific steps: Step S401: If the serving ASN gateway actively triggers the handover, Then, the serving ASN gateway sends an anchor DPF HO Trigger message to the erroneous ASN gateway, and carries the IP capability of the serving ASN gateway; Step S402: Anchoring the ASN gateway to send the anchored DPF switch to the serving ASN gateway request

(Anch DPF HO Request) message, which contains the IP capability of the anchor ASN gateway that the end user is using; Step S403: The service ASN gateway checks whether there is a matching IP capability that is used by the current end user in the anchor ASN gateway. If not, the switch is rejected. If yes, the process proceeds to step S404. Step S404: The CSN anchor switch is initiated by the service ASN gateway. The handover process is as described above, and details are not described herein. The step S401 is optional, and the step exists only in the case that there is a handover process actively triggered by the monthly ASN gateway. If the step S401 is performed, before the step S402 is executed, the anchor ASN gateway needs to check whether the IP capability of the serving ASN gateway is stored. The item matching the IP capability currently used by the terminal user, if yes, performs step S402, and if not, rejects the handover to prevent the service failure caused by the handover. The method for negotiating the use of the network element IP capability by the network side of the present invention reduces the possibility of service failure during mobile and access, and ensures the stability of the network. The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

A method for negotiating a network element IP capability on a network side, which is used for access authentication of a WiMAX terminal user, and includes the following steps:

A. Configure the ASN gateway adjacent to the ASN gateway or the IP capability supported by the AAA server in the service network CSN on the access service network ASN gateway, including simple IPv4, simple IPv6, Client-MIP4, Proxy-MIP4, Client- One or more of MIP6, Proxy-MIP6;

B. When it is necessary to check the ASN gateway of the opposite node or the AAA server IP capability in the CSN, the ASN gateway matches the IP capability supported by the ASN and the IP capability of the peer node. If there is a match, select one of the IP capabilities. Continue the business; otherwise terminate the business according to its own strategy.

The method according to claim 1, wherein when the IP capability needs to be checked in the step B, the method includes: determining, by the terminal user, whether the terminal user can authorize the terminal user to access the WiMAX network And, the ASN needs to initiate a CSN anchored handover for an online terminal user decision.

The method according to claim 2, wherein, in the initial network access process of the WiMAX terminal user, the step B specifically includes:

After the basic capability negotiation is completed, the ASN gateway sends an identifier request message to the terminal, which is used to obtain the network user identifier NAI of the terminal user;

B4. The ASN gateway receives an identifier response message of the terminal, and obtains a network access identifier.

B5. The ASN gateway parses the AAA server in the CSN that the terminal user needs to access according to the network entry identifier, and configures the IP capability of the AAA server.

The method according to claim 2, wherein the CSN anchor handover procedure initiated by the ASN gateway to be initiated by an end user includes:

C1. If the handover is initiated by the current anchor ASN gateway, obtain the IP capability of the current serving ASN gateway node according to the IP capability configuration in step A before the handover. If there is no IP capability matching the local ASN gateway, The handover is terminated; if there is an IP capability matching the current ASN gateway, the handover procedure of the CSN 4 seedling is completed.

The method according to claim 2, wherein the CSN anchor handover procedure initiated by the ASN gateway for an end user includes:

C2, if the handover is initiated by the current serving ASN gateway, the IP capability configuration in the step A before the handover acquires the IP capability of the currently anchored ASN gateway node. If there is no IP capability matching the local ASN gateway, then The handover is terminated; if there is an IP capability matching the current ASN gateway, the handover process of completing the CSN 4 seeding is entered.

a. When the access authentication of the WiMAX terminal user is performed on the network side, the ASN carries the IP capability supported by the ASN to the home CSN through the Radius access request message.

b. The home CSN carries the IP capability supported by the CSN or the IP capability of the ASN required by the CSN to the ASN in the Radius Access Accept message. These IP capabilities are: Simple IPv4, Simple IPv6, Client-MIP4, Proxy-MIP4, Client. - One or more of MIP6 and Proxy-MIP6.

7. Method according to claim 6, characterized in that the respective supported IP capabilities are exchanged between the ASN and the ASN via messages of the R4 reference point.